package lab02.test36;

public class Postgraduate extends Student {

    @Override

        String calGrade(){
            double avg=calAverage();

            if(avg>=90&&avg<=100)
                grade="优秀";
            else if (avg>=80&&avg<90)
                grade="良好";
            else if (avg>=70&&avg<80)
                grade="一般";
            else if (avg>=60&&avg<70)
                grade="及格";
            else
                grade="不及格"
                        ;


            return grade;
    }
}




